Thompson and Savage follow up Polar Bear Night (2004) by giving the polar bear cub from the first book another chance to explore her surroundings, as well as make a new friend. Savage’s linocuts, with their round shapes and creamy sunrise palette of pinks and blues, are once again showstoppers (a spread in which the bear and her new friend enjoy a perfect quiet moment under the sea is especially nice), while Thompson’s restrained prose conveys plenty about the pleasures of companionship. Ages 3–5. (Feb.)